Put safeguard in dismissPip

Not able to reproduce the crash but in general, dismissPip should not
happen when not in PiP mode.

Bug: 155024023
Test: N/A
Change-Id: Iea19ffc632ca8ca411b25d8b08ee4e91b2dd7360

packages/SystemUI/src/com/android/systemui/pip/PipTaskOrganizer.java

@@ -238,6 +238,11 @@ public class PipTaskOrganizer extends TaskOrganizer {
      * @param animationDurationMs duration in millisecond for the exiting PiP transition
      */
     public void dismissPip(int animationDurationMs) {
+        if (!mInPip || mToken == null) {
+            Log.wtf(TAG, "Not allowed to dismissPip in current state"
+                    + " mInPip=" + mInPip + " mToken=" + mToken);
+            return;
+        }
         final WindowContainerTransaction wct = new WindowContainerTransaction();
         wct.setActivityWindowingMode(mToken, WINDOWING_MODE_UNDEFINED);
         WindowOrganizer.applyTransaction(wct);